Steam-boiler.



T. T. PARKER.

STEAM Bouin. APPLICAToN man MAY16.1917.

` .Patented Mar. 19, lQH Z? .2Q g', ff

THMAS T. PARKER, F N EW YORK, N. Y.

STEAM-BOILER.

anestesia Specification of Letters Patent.

Patented Mar. 19, 1918.

Application led May 16, 1917. Serial No. 168,937.

o aZ whom t may-concern:

it known that I, THOMAS T. PARKER,

a citizen of. the United States, and residentl of the city of New York, in the county of Kings and Stateof New York, have invented certain new`and useful Improvements in Steamloilers, of'which the following is a specication.

rhis invention relates to steam-boilers, 1G and particularly to boilers of the Stirling type wherein a series of drums arranged in spaced parallel relation to each other are connected by banks Aot' water-tubes through which the water circulation is effected. i5 The object of my invention is to increase the efficiency of a boiler of the character mentioned by eectually separating the greater percentage of the total steam from the circulating water, as rapidly as the zo steam is generated, and thereupon superheating the separated steam preparatory to its association with the remaining steam,

also is to protect the superheater fromthe destructive action of the heat from the 2a furnace gases when the boiler is being tired up cold, that is, when the superheater is ille-d with air. A

invention comprises a transverse drum water-tube boiler having a lower water drum sa and two upper steam-and-water drums, the latter drum being located at the front and rear respectively of the boiler setting, three banks of water tubes whereof two banks connect the lower drum with the upper drums respectively and whereof the remain-- bank connects the two upper drums, and a bank of superheating tubes connecting the upper portions of the two upper drums, said ing having therein a fire box below the ward bank of water tubes, an outlet in rear of the rearward Abank of tubes, and a wail located below the bank of connecting water tubes for the upper drums, said wall y Lhaving an opening therethrough, and a manualiybperative damper for said opening, whereby the hot gases in their flow from the iire box to the said outlet can be diverted through a path below the last-named watertubes, as will be hereinafter described and claimed.

the drawin f."Figure 1 is a lgong'itudinal vertical vsection embodying my invention.

, a is a motion, enlarged, of a portion water-tube and drum type of steamV of one ofthe superheater' tubes showing its intern al deflecting and protecting member.

Referring to the drawing, designates the boiler setting; 1l the furnace at the lower forward part thereof, and 12 the out- 60 let to the breechingor stack at the rear.

13, 14 and 15 designate the boiler drums;

13 and 14 being the upper steam-and-water drums, and 15 being the lower water or mud drum. The drum 14', which is relatively 65 higher than the other, is provided with a feed-water inlet 16 and with a steam outlet 1' f 18 designatesl the forward bank of tubes connecting the drums 13, 15; 19 the rear- 70 ward bank of tubes connecting the drums 14, 15, and Q0 the, upper bank of tubes connectingthe drums 13, 14; thereby establishing circulatory communication throughout the drums and tubes. l

21, 22 designate the-baliles arranged to provide the requisite passes for the gases in their indicated-course from the furnace to the breeching.

The steam-space of the drum 13 iscon- 80 nected with thc steam-space of the drum 14 by a bank of superheater tubes 23 which are subjected to the action of the heat from the' hot gases unless such gases be diverted from their normal course as below explained. The steam as rapidly as it enters the steamspace of the drum 13 passes into the superheater tubes and thence into the steam-space of the drum 14, such steam in its prolonged .travel through the tubes thus being'eifectu- 90 ally dried and superheated by absorption of the heat conducted through the Walls of the tubes. By the construction and arrange ment described about eighty per cent. of the total steam genera ted in the boiler enters the superheater tubes and is therein superheated preparatory toits commingling with the remaining ysteam in the steam-space of the drum 14. The practical importance of this superheating feature/is obvious; but, in addition, another important advantage is obtained, namely, by the separation and removal of the steam from the drum 13, the Water entering and flowing through the water-tube bank 20 connecting the two upper drums, is solid, z'. e., it contains no en trained steam, and hence the effectiveness of the water heating surface of the said tubes 20 is materially increased.

24 designates spirally-twisted strips of 11o sheet-metal confined within and extending among the superheater tubes,

viating the otherwise liability of dburning lengthwise of the superheater tubes, which strips perform the important function of laterally detlecting the steam and causing it to impinge directly against and throughout the inner walls ofthe tubes as it flows therethrough. Ylhus the steaml absorbs more heat and hence attains higher superheat, and at the same time serves to protect the eX- posed surface of the tubes from the destructive action of the direct heat from the furnace gases. Each of the strips 24 preferably comprises a series of sections arranged end to end within the superheater tube, the meeting ends of the sections being connected by offset interlocking portions25, as seen in Fig. 2. Such sectional strips may be applied to the superheater tubes prior to or after the installation of the latter. The ends (26) of the strips are arranged to project slightly into the drum 14 so that such ends may be readily grasped by a suitable tool and thereby forcibly rotated, in which case the strips will eii'ectually scrape the ine terior of the tubes and expel the contained foreign matter into the drum 14, whence it can be readily removed. 4

The vertical heat baiiie 21, which is located over the bank of tubes 18 nearest the furnace, is provided witha transverse opening 27 equipped with a door 28 which may be opened or closed at will. In the present instance the door is pivotally mounted similarly, to a damper, and it is likewise provided with an external operating handle 29.'

With water at normal level'in the boiler, the' furnace tire is started with the door` open, as indicated bythe dotted lines in the drawing. The hot gases on their way to the stack are diverted through the opening 27 and thus prevented from passing up to and thereby obout the latter. When the steam pressure is raised and the boiler put in service rthe door 28 is closed. The steam generated in the for'- ward bank of tubes 18 rises to the surface in drum 13 and iiows through the superheater tubes 23 to drum 14. .Steam generated in bank 19 flows also into drum 14 and therein eommingles with the superheated steam, and absorbs therefrom a portion of the superheat, the entire volume of dry steam thence flowing through the` steam outlet 17. The water from drum 14 flows to drum 15 and upward again to drum 13,

and so on, thereby establishing a free and unrestricted circulation with `a superior super-heating effect.

The spiral deflecting and cleanin above described form the subject o a divisional applicationSerial No. 200,276, led November 5, 1917.

'It is to -be understood thatthe Adetails of construction herein disclosed, maybe modie lied within the 4principle of my invention and the scope of the appended claim.

. I claim:

A transverse drum water-tube boiler hav- 'ing a lower water drum and two upper steam-and-water drums, the latter drums be. ing located at the front and rear respectively of the boiler setting, three banks of water tubeswhereof two banks connect the lower drum with the upper drums respectively and whereof the remaining bank connects the two upper drums, and a bank of superheating tubes connecting the upper portions of the two upper drums, said setting having therein a fire box below the forward bank of water tubes, an outlet in rear of the rearward bank of water tubes, and a vertical devices wall located below the bank of connecting water tubes for the two upper drums, said wall having an opening therethrough, and a vmanually-operativev damper for said opening, whereby the hot gases in their flow from the iire box lto the said outlet can be diverted through a path below the lastnamed water-tubes.

Signed. at New York, in the county and State of New York, this 14th day of May, A. D. 1917.

THOMAS T. PARKER. 

